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本文测定了雾化高温分解(AHTD)法制备的一系列Cu/ZnO催化剂的铜表面积,并将其与催化活性进行了关联。结果表明在含有CO_2的原料气中,催化剂活性位可能是由Cu~0组成。AHTD法Cu/ZnO催化剂的CO-TPD显示出两个明显的脱附峰,低温脱附的CO可能是吸附在Cu~+上的。Cu~+在无CO_2的原料气中起了催化作用。X射线诱导Auger谱测定结果表明,还原活化后和反应2小时后催化剂表面除大量的Cu~0外,还有少量的Cu+存在,在CO_2含量不大时(1～3％),Cu~+量与原料气的组成无关。
In this paper, the Cu surface area of a series of Cu / ZnO catalysts prepared by atomization pyrolysis (AHTD) was measured and correlated with the catalytic activity. The results show that in the feed gas containing CO_2, the catalyst active site may be composed of Cu ~ 0. The CO-TPD of Cu / ZnO catalyst by AHTD method shows two obvious desorption peaks. The desorption of CO at low temperature may be adsorbed on Cu ~ +. Cu ~ + played a catalytic role in CO_2-free feed gas. The results of X-ray induced Auger spectroscopy showed that a small amount of Cu + was present on the surface of the catalyst after reduction and activation and after 2 hours of reaction, while Cu ~ + The amount of raw material gas composition has nothing to do.